Have you ever given up first dibs on something because you lost at rock paper scissors? Here's a way to practise your skills without putting anything at stake (except your pride).
Up there with coin tosses and dice rolls, the classic game of rock paper scissors has settled many an argument. In theory, rock paper scissors is totally random, but it actually isn't (see this guy). Based on psychology and lots of data, we can predict the chances of what someone will throw based on what they threw last.
For the record, that screenshot is totally a humblebrag. I quickly went down seven games to three. While the normal setting of this game only uses the data it collects on you, the veteran setting of this game gathers data from all the other people it has played.
Think you have what it takes? Check it out at the link below.
Rock-Paper-Scissors: You vs. the Computer [The New York Times]